Chemical Engineering MCQs

Page No. 621

For transporting pasty material, one will use a/an__________________?


aApron conveyor

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bBelt conveyor

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cScrew conveyor

✓


dBucket elevator

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View Answer Screw conveyor

Dispersion of a gas through liquid is done by using a__________________?


aSparger

✓


bKneader

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cMasticator

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dNone of these

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View Answer Sparger

The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be_________________?


a0.5 Wi

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bWi

✖


c1.34 Wi

✓


d3.34 Wi

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View Answer 1.34 Wi

Which of the following oxides is not present in hematite iron ore ?


aTitanium oxide

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bCalcium oxide

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cCobalt oxide

✓


dManganese oxide

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View Answer Cobalt oxide

In filtration, the use of ‘filter aid’ helps in__________________?


aReducing the filtration pressure

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bAccelerating the rate of filtration

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cDeplugging the filter medium

✓


dEnhancing the cake porosity in case of a dense impermeable cake

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Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator ?


aCresylic acid

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bCopper sulphate

✓


cCalcium carbonate

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dSodium carbonate

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View Answer Copper sulphate

The filtrate flow rate in constant pressure filtration___________________?


aContinuously increases

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bContinuously decreases

✓


cRemain constant throughout

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dMay increase or decrease; depends on the pressure

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In case of a ball mill ?


aCoarse feed requires a larger ball

✓


bFine feed requires a larger ball

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cOperating speed should be more than the critical speed

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dNone of these

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Separation of solid suspended in liquid into a supernatant clear liquid and a denser slurry employs a process termed as the___________________?


aCoagulation

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bFlocculation

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cSedimentation

✓


dClarification

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View Answer Sedimentation

Gyratory crushers compared to the reciprocating jaw crushers__________________?


aHave greater capacity per unit of discharge area

✓


bCrush intermittently

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cAre less suitable for coarse materials

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dHave less steady power consumption

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